Contraction-joint stake



April 8, 1930. RQ R. RQBERTSON 1,753,316

` CONTRACTION JOINT STAKE .Filed May 18, 1929 Patented Apr. 8, 1930 ,y UNITE/D* vSI1-'Liaras PAT Y ROBERT RQ Ronnmson, or' CHICAGO HEIGHTS. ILLINOIS,v

CONTRACTION -JOINT STAKE Application filed may 1s, 1929. seriarna 364,166.

l This invention relates to concrete road construction work and more vparticularlyzto an improved contraction joint' stakeV or pin adapted to be used with a contraction'joint 5 center strip to hold the same in proper vertical position to securely hold the center strip properly seated on the sub-grade and having a head so formed'to provide locking orretaming means whereby the centerv strip is 10 prevented from floating or moving upwardly away fromthe sub-'grade after concrete has been poured to completeothe road.

It is an object ofthisinvention to provide lan improved stake or pin of channel cross lsection having one end thereof tapered and the other end bentvover upon itself with the bent over section offset with respect to the body of the ystake to a'ifordknot vonly a reinforced head for the stake butsuitable flange means adapted yto coact with a contraction joint center strip to prevent the same from moving out of contact with-a'road sub-grade after the concrete has been poured and begins to set.

' It is also an object of this invention to provide an improved channel stake for use in connection with a contractionjoint center strip, said stake having one end thereof bent over upon itself and offset to provide ata- 30 Ypered Wing'or projection at one sideof the stake to obviate any possibility of a contraction center strip from moving out of contact with the road sub-grade after the centerstrip has been stakedlin position. Y

It is a further object ofithis invention to provide an improved contraction joint center strip retaining stake having one end thereof bent over upon itself and oset to one side of the stake to afford a wing member adapted to engage against the apertured channel portion of the center strip to hold the same locked against anupward movement away from the roadsub-grade after the pouring of concrete around the contraction joint ycenter strip.l

- YIt is an important object of this invention to provide an improved concrete road center strip Vretaining stake of substantially straight channel construction having an entrance tip or polnt at one end thereof and a reinforcedhead at the other endY thereof formed with a projecting.. wing adapted to serve as a means for holding a contraction center strip locked f in position properly seated on a vroad ,subf

ENT oFFlcEff grade during the pouring of concrete andthe inal setting of the same. .A Y

v *OtherV and further important objects of this invention willbe apparent from'the disclosures in the specification and theaccomlpanying drawings.

This invention (in a preferred form) 'is ili lustrated in the drawings and r hereinafter Vmore fully described.

'On the drawings:

Figure 1 is a fragmentary verticalsectional viewthrough a concrete road and subgrade illustrating afsectional view of a contraction center strip held in position by means of an improved stake *embodyingy the principles of .thisinvention j 'Figure 2 is an enlarged fragmentary elevationall view of the contraction joint stake.

position by of the modified form 0f contraction joint l stake.

Figure 7 is a fragmentary perspective View j of the upper end of a modified form of stake with the end bent outwardly. j g As shown onthe drawings: Thek referencenumeral y l indicates a -con crete road'sub-grade having acontraction n joint center strip k2 seatedthereon` to aord a center stripl placed longitudinallyjdown the center of the road. 'n The middle portion of the contraction center strip2 is formedk with a V-channel Shaving openings therein for thereception of a contraction joint stake orpin.` -f y Thelcontraction center strip is'ada'pte'd to be secured in position upon the subrgrade by means of an improved stake orpin` embody- I ing the principles of this invention and comor point 6. The opposite end of the straight j channelbody section of the stake. has the end thereof bent over and partly offset at an angle and is pressed into the channel groove of the stake to form an inner reinforcing section 7 one flange of which projects over one of the flanges 5 of the stake to provide a tapered or pointed wing or lip 8.V The bent Vover reinforcing portion' '.7 of the stake af -fords a strong head at the upper end of the vstake' to'permit the stake to be driven into the sub-grade 1. The advance of the stake into thesub-grade is limited by the wing or 'lip `8 which is adapted to seat or rest against the upper surface of the V-channel 3 of the contraction center strip as clearly illustrated in' Figure 1.

It will thus be noted that the improved stake which is adapted to be projected through the openings in the channel portion 3 ofthe contraction center strip is adapted to be driven into the sub-grade until the inclined lower edge of thewing or lip 8 ofthe reinforced head portion ,of the stake comes vinto contact with lthe upper surface of the channel portion of the center strip. After a center strip has been staked in position by means of the improved contraction joint stake concrete 9 is poured onto the sub-grade on opposite sides of the mounted center strip to a point wherein the upper edge of the `center strip is positioned substantially .one-half i inch below the top surface of the pavement. The V in the center strip affords a' dovetailed ljoint between the center strip and the concrete 9 which securely holds the two slabs on opposite sides of the center strip in position. Under ordinary conditions the forcing 'of'concrete into the V pocket of the center strip acts to dislodge the center strip or sometimes raise the same out of Contact with the top surface of the sub-grade thereby producing what might be termed a floating .center strip.- The improved contraction joint stake of this invention obviates the above difficulty vsince the projecting wing or lip 8 of the stake acts as a locking means to hold the'center strip locked or seated in position upon the sub-grade se that the saine cannot `move away from the sub-grade or float when concrete is poured ,upon the sub-grade.

Figures 5 and 6 of the drawings illustrate a modified form of arcontraction center strip retaining stake or," pin comprising a: shank of substantially straight channel 'construe tion comprising aback or main plate 10 the longitudinal margins of which are bent overatsubstantially right angles to form Vflanges 11. One end of the shank or body portion of the stake is cut to aiford a tapered tip 12. The upper end of the shank of the stake is bent over upon itself with the bent over portion slightly deflected at an angle with respect to the shank portion of the stake and pressed into the channel groove of the shank with one side portion of the bent over section projecting outwardly over oneof the shank flanges 11 to afford a wing or lip 13 one corner of which is cut away to afford the inclined edge 14 thereby forming the lower portion of the wing 13 into a'wedge member adapted to be wedged into one of the openings of the V rib or channel v3 of the contraction center strip as clearly illustrated in Figure v5- to hold said center strip securely mounted in position upon a sub-grade 1 when the tapered endl of the sta-ke is driven into the subgrade. The portion 15 of the shank which is bent over and is pressed into the -channel portion of the upper end of the shank of the stake serves las a reinforcing member for the upper end of the stake and affords a doublethickness head to permit the stake to be driven into the road .sub-grade without any damage to the upper end of the stake. The wedging action of .thelower tapered end Yof the wing 13 of the stake when engaged through the apertures of a contraction cen.

ter strip `as illustrated in Fig-ure 5 serves to hold the center strip properly seated upon the sub-grade to prevent the same from moving away from said sub-grade when concrete is poured upon the sub-grade after the center strips rhave been located in position.

Figure 7 illustrated a modified form of stake comprising a channel shank or body section 16the upper end of which Vis bent 4over outwardlyupon itself to afford a rein'-` forced head 17. The bent over portion is slightly off-set or disposed at fan angle with respect to the shank 16 4and has one corner of one of the flange port-ions thereof bent over at an angle to form a tapered or pointi ed wing or lip 18. The lower end of the stake shank 16 is pointed to form a tip. The wing or lip 1.8 is adapted to serve as astojp to limit the movement of the stake `through the openings of a center strip similarto the arrangement illustrated in Figure 1.

It will of `course be understood that various details of Yconstruction may be varied through a wide range without departing from the principles of this invention, and it is therefore not proposed to limit the patent granted hereon otherwise than necessitated by the scope of the appended claims.

` l claim as my invention: n

1. A contraction joint stake comprising a channel cross sectioned body cut to aiiord a tapered tip at one end and having the opposite end bent over upon itself and offset with a portion kof Vthe bent over section projecting beyond one side of the body portion of the stake to aord a Wing member.

A contraction joint center strip retaining stake comprising a body portion of substantially straight channel cross section, said body portion tapered at one end to afford a tip, and a reinforcing member integrally formed on the upper end of the body portion of the stake and having one corner thereof projecting beyond one side of the body por-v tion of the stake to 'form a tapered Wing adapted to seat against a lportion of a center strip to hold the center strip locked in vposition on a road sub-grade to obviate floating of the center strip when concrete is poured.

3. A contraction joint cent-er strip retaining stake comprising a channel .cross sectioned substantially straight body section having the upper end thereof bent over and pressed into seating contact with the upper end of the body section With one portion of the bent over section protruding beyond one side of the body portion of the stake to afford a stop Wing.

4. A contraction joint center strip retaining stake comprising a body portion having a tapered tip formed on one end thereof andl having the opposite end bent over and tightly pressed upon itself at an angle with respect to the body section to form a reinforcing head for the stake and a stop member for limitingl the distance of travel of the stake into a road sub-grade.

5. A contraction joint stake comprising a substantially straight grooved body portion, a pointed tip integrally. formed on one end thereof, and a reinforcing means formed on the other end of the body portion With a portion of the reinforcing means projecting beyond one side of the stake to form a stop member. l

6. A contraction joint stake comprising a grooved body portion bent over at an angle rupon itself at one end Witha tapered portion of the bent over section projecting beyond one side of the stake to afford a lock member.

7. A contraction joint stake of the class described comprising a substantially `straight grooved body portion having one end thereof bent over upon itself at an angle to afford a reinforcing member and a laterally project ing wing member.

8. A contraction j channel cross sectioned body having one end thereof bent over upon itself to form a reinforced head for the stake.

9. A contraction joint stake comprising all substantially straight channel cross sectioned body lhaving oneend thereof bent over upon itself to form a reinforced head for the stake and also provide a projecting stopk member on one side of the reinforced head of said stake. Y

10. A contraction joint stake comprising a channel body portionhaving one end thereof bent over upon itself and disposed at an 11. A contraction joint stake comprising a grooved body portion having one end thereof bent over upon itself at an angle with one portion of the bent over section projecting beyond one side of the stake and tapered to afford a Wedge stop member.

12. A contraction joint stake comprising a channel cross sectioned body portion having one end thereof bent over upon itself to form a reinforced head for the stake, and a Wedge member projecting from one side of the reinforced head section of said stake.

' 13. A contraction joint stake comprising a grooved body portion, and a tapered stop member integral with the body portion and and projecting from one side near one end thereof. f n K 14. A contraction joint stake of the class described comprising a channel body portion having a tapered Wing member projecting from one side near one end thereof and formed by bending over the material forming one end of said stake'. Y

15. A contraction joint stake comprising a strip having the longitudinal margins bent over to afford flanges, and a stop Wing projecting over one of said flanges and beyond one side of said stake, said stop Wing formedk by bending over a portion of said flange upon itself and then again bending the bent over f portion of the flange to vform the projecting stop Wing.

16. A contraction jointy stake comprising a flanged body portion having a Wedge mem ber formed on one side near one end thereof. 17. A contraction joint stake comprlslngal body portion having a Wedge flange project- Y Illinois.

` ROBERT R. ROBERTSON.

oint stake comprising a,y A 

